Can I use this filter for mask(face mask) liner?

Because of the micron size of viruses, only very specific masks have any chance of filtering them out-and even those ones HAVE to be professionally fitted to have any efficacy (like the N95-which even when professionally fitted and used properly only stops 95% of virus micron size) and MUST be worn under very strict guidelines otherwise it offers no more virus protection than the cloth and surgical masks- which do not do not stop virus micron size from getting thru at all. To actually stop virus micron size you will either have to invest in a professionally fitted N95 and strictly follow the wearing protocol or to purchase a professionally rated respirator that guarantees to filter micron size of 0.01 or under (such as what virologists use in labs). Do not forget that viruses enter thru mucous membranes and so eye protection (such as goggles) will also be a MUST if you want to be truly protected from anything with a virus micron size. Hope this helps!

It says it's 1/4 inch thick in the picture and 1/16 in thick in the description, which is it?

1/16th, but can be doubled, tripled, or quadrupled, etc., in thickness.

Can this be put inside the air opening of a window AC unit to block out the light that comes through the vent?

I would rate its opacity to approx. 70%-80% (when clean and new). Remember, this is designed to trap small dust particles. As it does its job, it will become more opaque as well as not pass air efficiently.

I don't know the answer for his particular filter material, but washing was not recommended for other carbon filter pads I used in the past.

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🌬️ Elevate your air game—because your space deserves the freshest vibe.

DEEP CLEAN AIR POWER - 3/16" thick activated carbon traps dust, smoke, pet hair, and VOCs for fresher, healthier indoor air.
AMERICAN MADE ASSURANCE - Proudly crafted in the USA with strict quality control for reliable, long-lasting filtration performance.
CUSTOM FIT ZERO HASSLE - Cut the 16"x48" sheet to perfectly fit any air purifier, furnace, or AC unit—one size truly fits all.
MULTI PURPOSE FRESHNESS - Ideal for everything from range hoods to 3D printers—eliminate odors and airborne contaminants everywhere.
DIY FRIENDLY INSTALLATION - No tools or tech skills needed—upgrade your air quality in minutes and breathe easier instantly.

This premium activated carbon filter pad from Fresh Headquarters offers a versatile 3/16" thickness and a large 16" x 48" sheet that can be cut to fit a wide range of air purifiers, furnaces, ACs, and more. Made in the USA, it efficiently captures dust, smoke, pet hair, and VOCs, providing long-lasting, professional-grade air filtration that’s easy to install and maintain.

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Brand Name	FRESH HEADQUARTERS
Model Info	14207192
Item Weight	3.84 ounces
Product Dimensions	18.9 x 6.3 x 0.1 inches
Item model number	14207192
Is Discontinued By Manufacturer	No
Part Number	14207192
Compatible Device	Air Conditioner, Air Purifier, Compost Bin, Furnace
Material Type	Activated Carbon
Batteries Included?	No
Batteries Required?	No

Activated Carbon Filter Pad - Cut To Fit Air Filter Roll for Improved Filtration - Universal Carbon Sheet for Air Purifier, Furnace, AC, Range Hood, 3D Printer, and Odor/VOC Control

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